Device for incandescent lamps



F. W. SALZ DEVICE FOR INCANDESCENT LAMPS Sept. 18, 1923. nwwm Filed Jan. 18 1919 fig! Fig: 2

INVENTUH FHEJJERIEK W. SALZ .His ATTUHNEY Patented Sept. 18, 11923.

UNHTEW STATE PATENT @FFHCZE.

GENERAL ELECTRIC COM- PANY, A CORPORATION OF NEW YORK.

DEVICE FOR, INCANDESCENT LAMPS.

Application filed January 18, 1919. Serial No. 271,882.

To all whom it may concern.

Be it known that I, FREDERICK W. SALZ, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga, State of Ohio, have invented certain new and useful Improvements in Devices for Incandescent Lamps, of which the following is a specification.

My invention relates to means for holding chemicals such as getters in electric incandescent lamps and has for its object the provision of a simple holding means which will be easy to mount and which will permit the chemicals to be placed in the most effective position in the bulb.

Getters are used in incandescent lamps to prevent blackening of the bulb and generally consist of chemicals which combine with the tungsten evaporated from the filament. The getter is usually in the form of a solid which is converted into a gas by the heat from the filament. To be effective the getter must be locatednear the filament but must be prevented from changing into a gas too rapidly. In order to obtain a secure holding means for the getter, it is desirable to provide a receptacle for the same, but,

heretofore, when this has been done, it has been attended with considerable difficulty of manufacture and the results have not been entirely satisfactory.

According to my invention, the getter is inserted in a removable receptacle, preferably tubular, and is attached to a suitable lam part by an attaching means which is preferably easily attachable to or detachable from the receptacle. that the attaching means be easily attachable to or detachable from the lamp part. The latter is preferably the glass rod or stem holding the filament supports and the point of attachment is preferably within the space about which the filament is draped.

In the drawing, Fig; 1 is an elevation of an incandescent lamp equipped with aholder embodying my invention; Fig. 2 is a plan view of a clip forming part. thereof; Fig. 8 is an elevation of the clip; Fig. 4 is an elevation of a tube also forming part of said invention, and Fig. 5 is an end'view of the tube.

Referring now to the drawing, the getter compound 1 is placed in the tube 2 which is then stopped at both ends with a porous ma- It is preferable alsoterial 3 such as a paste made from ground asbestos. The clip 4 as shown is substantially S-shaped and one loop thereof receives the tube 2 and the other loop the glass rod 5 of the lamp. The tube 2 should be of substantially the same diameter as the rod 5 so that both ends of the clip will be of the same size and discrimination by the assembler is unnecessary. The parts are of such size that the tube is sprung into the clip and the clip sprung over the rod. This is done before the winding of the filament in the case of the type of lamp illustrated.

In its preferred form, my invention comprises a tube, open at least at one end and preferably at both ends. A stopper is provided at each open end to retain the getter and, in order that the getter may be properly volatilizedor, at any rate, that there shall be proper contact between the getter and. the gaseous contents of the bulb, this stopper is of porous material. To attach the tube to the proper lamp part, there is provided a clip which preferably is constructed and arranged so that one end thereof will spring over thetube and the other over the lamp partr What I claim as new and desire to secure by Letters Patent of the United States, is

i 1. In an electric incandescent lamp comprising a glass bulb, a filament supporting stem and a filament draped therearound, the combination of a receptacle containing a body of getter and a spring clip attaching the same to a portion of said stem within said filament.

2. In an electric incandescent lamp comprising a glass bulb, a filament supporting stem and a filament draped therearonnd, the combination of a receptacle containing a body of getter and a spring metal clip detachably holding the same to a portion of said stem within said filament,

3. In an electric incandescent lamp comprising a glass bulb, a filament supporting stem and a filament draped therearound, the combination of an open ended receptacle containing a body of getter and a spring clip attaching the same to a portion of said stem within said filament.

In witness whereof, I have hereunto set my hand this fifteenth day of January,

FREDERICK W. SALZ. 

